The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 1C —Examples of discrepancy between body weight, body mass index (BMI), and noise at level of heart. All images are axial unenhanced images obtained at 300 mA. Insets in top right-hand corner show anteroposterior topograms. SD represents noise level and has exponential relationship with attenuation coefficient of scanning region. SD values were obtained from centrally located left atrium that contains homogeneous fluid (blood). Unenhanced image of 60-year-old woman who weighs 48 kg (BMI = 21.33) has high noise level (SD = 16.02 H) because of cardiomegaly and pericardial effusion.